﻿// Copyright 2005, 2006 - Morten Nielsen (www.iter.dk)
//
// This file is part of SharpMap.
// SharpMap is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// SharpMap is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License
// along with SharpMap; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 


namespace Petra.Gis.ReferenceSystemServices
{
  /// <summary>
  /// Orientation of axis. Some coordinate systems use non-standard orientations. 
  /// For example, the first axis in South African grids usually points West, 
  /// instead of East. This information is obviously relevant for algorithms
  /// converting South African grid coordinates into Lat/Long.
  /// </summary>
  public enum AxisOrientationType : short
  {
    /// <summary>
    /// Unknown or unspecified axis orientation. This can be used for local or fitted coordinate systems.
    /// </summary>
    Other = 0,
    /// <summary>
    /// Increasing ordinates values go North. This is usually used for Grid Y coordinates and Latitude.
    /// </summary>
    North = 1,
    /// <summary>
    /// Increasing ordinates values go South. This is rarely used.
    /// </summary>
    South = 2,
    /// <summary>
    /// Increasing ordinates values go East. This is rarely used.
    /// </summary>
    East = 3,
    /// <summary>
    /// Increasing ordinates values go West. This is usually used for Grid X coordinates and Longitude.
    /// </summary>
    West = 4,
    /// <summary>
    /// Increasing ordinates values go up. This is used for vertical coordinate systems.
    /// </summary>
    Up = 5,
    /// <summary>
    /// Increasing ordinates values go down. This is used for vertical coordinate systems.
    /// </summary>
    Down = 6
  }
}
